Leave it dont get depressed. Ask your guy who sold you the engine to replace this ECU this is automatic you definately need manual. I ended up doing the same else car cant maintain many things accordingly ECU does not see your car moving, constant check light, possible Limp mode, Most important Change it immediately, Google the ecu number compatable for this engine then search it. Else you cant have good power, econom.
Depressing but you got to do it rite.